US20150131058A1 - Autostereoscopic projection device and display apparatus - Google Patents
Autostereoscopic projection device and display apparatus Download PDFInfo
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- US20150131058A1 US20150131058A1 US14/259,872 US201414259872A US2015131058A1 US 20150131058 A1 US20150131058 A1 US 20150131058A1 US 201414259872 A US201414259872 A US 201414259872A US 2015131058 A1 US2015131058 A1 US 2015131058A1
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B30/00—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images
- G02B30/20—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes
- G02B30/26—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes of the autostereoscopic type
- G02B30/27—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes of the autostereoscopic type involving lenticular arrays
- G02B30/29—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes of the autostereoscopic type involving lenticular arrays characterised by the geometry of the lenticular array, e.g. slanted arrays, irregular arrays or arrays of varying shape or size
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- G02B27/225—
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B30/00—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images
- G02B30/20—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes
- G02B30/26—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes of the autostereoscopic type
- G02B30/27—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes of the autostereoscopic type involving lenticular arrays
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/2006—Lamp housings characterised by the light source
- G03B21/2033—LED or laser light sources
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/208—Homogenising, shaping of the illumination light
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/28—Reflectors in projection beam
Definitions
- the invention relates to an optical device and, in particular, to an autostereoscopic projection device.
- the basic concept of the stereoscopic display technology is to transmit the left-eye images and the right-eye images with different viewing angles to the left eye and right eye of the viewer respectively, and both of these 2D images are then combined in the viewer's brain to give the perception of 3D depth while the viewer perceive the stereoscopic images.
- the stereoscopic display technology can be divided into the glasses type, head-mounted type and autostereoscopic type according to the applied tools.
- the autostereoscopic display technology attracts more attention from industries because it needn't stereoscopic glasses or head-mounted devices but can provide 3D images to the naked eyes of the viewers.
- a conventional autostereoscopic projection device cooperates with a plurality of projection apparatuses (may be disposed in an array) so that the left eye and the right eye can view different images.
- this kind of design causes a considerable difficulty to the compactness of the projection device, and the optical path design among the projection apparatuses will become more complicated.
- Another design for achieving the same purpose is to transmit the images of different angles to the left eye and right eye respectively at different timings by the liquid crystal (LC) switch elements.
- LC liquid crystal
- an autostereoscopic projection device which has simpler optical path design, simpler control mechanism, better conversion efficiency, and less volume and weight.
- an objective of the invention is to provide an autostereoscopic projection device which has simpler optical path design, simpler control mechanism, better conversion efficiency, and less volume and weight.
- an autostereoscopic projection device comprises a light source, a light scanning module, a light transmitting module, a light combining module, a spatial light modulator module and a lens.
- the light source provides a light.
- the light scanning module includes an actuating device and a reflective surface, and the actuating device capable of deflecting the reflective surface.
- the light combining module includes a first light combining element.
- the spatial light modulator module includes a first spatial light modulator element. The normal vector of an incident surface of the first light combining element is coplanar with the normal vector of a reflective surface of the first spatial light modulator element, and the coplanar plane is perpendicular to a disposition plane of the projection device.
- the light provided by the light source module is transmitted through the light scanning module, the light transmitting module, the light combining module and the spatial light modulator module sequentially and then leaves the projection device through the lens.
- the light source module is a laser array or a laser unit.
- the autostereoscopic projection device further comprises a light uniforming module disposed between the light scanning module and the light source module. The light is transmitted sequentially through the light uniforming module and the light scanning module.
- the light combining module further includes a second light combining element
- the spatial light modulator module further includes a second spatial light modulator element and a third spatial light modulator element.
- the light After entering into the second spatial light modulator element and the third spatial light modulator element, the light is transmitted to the first light combining element by the second light combining element along the same direction.
- the light scanning module is a voice coil motor, polygon mirror, or MEMS lens.
- the spatial light modulator element is a digital micromirror device (DMD).
- DMD digital micromirror device
- the actuating device of the light scanning module deflects the reflective surface for different angles at different timings to form a plurality of different viewing regions.
- the light combining element is a total reflection prism.
- the light transmitting module is a reflective mirror.
- a display device comprises any of the above-mentioned autostereoscopic projection devices and a display screen.
- the autostereoscopic projection device forms a plurality of viewing regions on the display screen.
- the light source module is a laser array or a laser unit.
- the autostereoscopic projection device further comprises a light uniforming module disposed between the light scanning module and the light source module. The light is transmitted sequentially through the light uniforming module and the light scanning module.
- the light combining module further includes a second light combining element
- the spatial light modulator module further includes a second spatial light modulator element and a third spatial light modulator element, after entering into the second spatial light modulator element and the third spatial light modulator element, the light is transmitted to the first light combining element by the second light combining element along the same direction.
- the light scanning module is a voice coil motor, polygon mirror, or MEMS lens.
- the spatial light modulator element is a digital micromirror device (DMD).
- DMD digital micromirror device
- the actuating device of the light scanning module deflects the reflective surface for different angles at different timings to form a plurality of different viewing regions.
- the light combining element is a total reflection prism.
- the display screen includes a double lenticular lens
- the double lenticular lens includes two lenticular lens layers and a 2D diffuser disposed between the lenticular lens layers.
- FIG. 1 is a schematic diagram of an autostereoscopic projection device according to a first embodiment of the invention
- FIG. 2 is a schematic diagram of the imaging of the autostereoscopic projection device in FIG. 1 ;
- FIG. 3 is another schematic diagram of the imaging of the autostereoscopic projection device in FIG. 1 ;
- FIG. 4 is a schematic sectional diagram taken along the line A-A in FIG. 1 ;
- FIG. 5 is another schematic diagram of the imaging of the autostereoscopic projection device in FIG. 1 ;
- FIG. 6 is a schematic diagram of a display apparatus according to an embodiment of the invention.
- FIG. 7A is a schematic diagram of an autostereoscopic projection device according to a second embodiment of the invention.
- FIG. 7B is a schematic side view of the autostereoscopic projection device in FIG. 7A .
- the projection device of this embodiment can be a digital light processing (DLP) projection display, a liquid crystal projection display, or a liquid crystal on silicon (LCOS) projection display, for example.
- DLP digital light processing
- LCOS liquid crystal on silicon
- FIG. 1 is a schematic diagram of an autostereoscopic projection device according to a first embodiment of the invention
- FIG. 2 is a schematic diagram of the imaging of the autostereoscopic projection device in FIG. 1
- FIGS. 3 and 5 are other schematic diagrams of the imaging of the autostereoscopic projection device in FIG. 1
- FIG. 4 is a schematic sectional diagram taken along the line A-A in FIG. 1 .
- the projection device 1 of this embodiment at least includes a light source module 10 , a light scanning module 12 , a light transmitting module 13 , a light combining module 14 , a spatial light modulator module 15 and a lens 16 .
- the light emitted by the light source module 10 is transmitted through the light scanning module 12 , the light transmitting module 13 , the light combining module 14 and the spatial light modulator module 15 sequentially, and then leaves the projection device 1 through the lens 16 .
- the light source module 10 is disposed on a side of the light scanning module 12 and can provide light.
- the light source module 10 can be a laser array or laser unit.
- this embodiment can further include a light uniforming module 11 whereby the light can be uniformed into a bar-like light source entering into the light scanning module 12 .
- the light uniforming module 11 can be disposed between the light scanning module 12 and the light source module 10 . The light is transmitted sequentially through the light uniforming module 11 and the light scanning module 12 .
- the light uniforming module 11 can be an integration rod or a light tunnel for example.
- the light scanning module 12 includes an actuating device 121 and a reflective surface, and the actuating device 122 is capable of deflecting the reflective surface 122 .
- the light scanning module 12 can include a voice coil motor, polygon mirror, or MEMS lens, or their combinations.
- the voice coil motor of this embodiment can be a galvano mirror, which further includes a movable coil (not shown) disposed within a magnetic field.
- the movable coil can be driven by the current-induced electromagnetic force to rotate the shaft so as to deflect the reflective mirror that is connected to the shaft. Therefore, if the light scanning module 12 is a galvano mirror, the angle of the reflective mirror can be adjusted by controlling the current value of the galvano mirror.
- the angle of the reflective surface 122 in this embodiment can be deflected for 20° ⁇ 30°. If the bar-like light provided by the light source module 10 needs to be projected into 16 bar-like beams with different angles, the reflective surface can be deflected for 2.5° every time. In other embodiments, the bar-like light also can be projected into 32 different angles to form 32 viewing regions. In other words, the number of the projected angles can be adjusted according to the number of the viewing regions.
- the actuating device 121 of the light scanning module 12 can make the reflective surface 122 deflect to different angles at different timings to form a plurality of viewing regions. Therefore, the light of the light source module 12 on the X-Y coordinate plane can be transmitted to the Y-Z coordinate plane (as shown in FIG. 2 ) so as to be scanned and imaged on the Y-axis direction.
- the light transmitting module 13 is a reflective mirror disposed between the light combining module 14 and the light scanning module 12 . Because the light transmitting module 13 and the light scanning module 12 have an included angle of 45°, the light will be deflected for 90° when transmitted from the light scanning module 12 to the light combining module 14 , and can be imaged on the X-Z coordinate plane (as shown in FIG. 2 ).
- the light combining module 14 can include a first light combining element 141 , which can be a total reflection prism.
- the first light combining element 141 can reflect the light of the incident angle greater than a predetermined angle (e.g. 40°) and can be passed through by the light of the incident angle less than the predetermined angle. Therefore, the light transmitted by the light transmitting module 13 will be reflected and transmitted to the spatial light modulator module 15 .
- a predetermined angle e.g. 40°
- the light can be imaged to the X-Y coordinate plane (the coordinates on the left of the figure) from the X-Z coordinate plane (the coordinates on the right of the figure) of the first light combining element 141 and then transmitted to the first light combining element 141 again.
- the incident angle of the light is less than the predetermined angle so the light will pass through the first light combining element 141 .
- the region C in the figure represents the incident region through which the light can enter into the first light combining element 141 and can be transmitted to the projection lens.
- the region C represents the angle of the light that can pass through the first light combining element 141 (i.e. the incident angle less than the predetermined angle), so the light that is imaged to the portion outside the region C will be reflected (i.e. the incident angle greater than the predetermined angle).
- the spatial light modulator module 15 includes a first spatial light modulator element 151 , which can be a digital micromirror device (DMD) for example.
- DMD digital micromirror device
- the DMD with the deflection range of 12° ⁇ 12° can control or modulate the incident light by switch elements.
- the DMD When the DMD is at the “on” state, the light transmitted by the first light combining element 141 will be reflected into the first light combining element 141 again and then enter into the lens 16 to be imaged on the display screen 2 .
- the DMD when the DMD is at the “off” state, the light transmitted by the first light combining element 141 will not be imaged on the display screen 2 .
- the normal vector V1 of the incident surface 141 A of the first light combining element 141 is coplanar with the normal vector V2 of the reflective surface 151 A of the first spatial light modulator element 151 , and the coplanar plane is perpendicular to the disposition plane P of the projection device 1 .
- the first light combining element 141 and the first spatial light modulator element 151 in this embodiment are disposed along the same direction, not like the conventional projection device where the first light combining element 141 and the first spatial light modulator element 151 are disposed by an included angle of 45°. Therefore, this embodiment has the advantage of expanding the imaging range B of the spatial light modulator to the range B′ (the imaging range is expanded from 24° to 40° when the DMD is used as the spatial light modulator element for example), and therefore the etendue (the product of the area and the solid angle) of the total light of the projection device can be increased so that a larger amount of the light and more viewing regions for the imaging on the display screen 2 can be obtained.
- FIG. 6 is a schematic diagram of a display apparatus according to an embodiment of the invention.
- the display apparatus 3 of this embodiment includes the above-mentioned projection device 1 and the display screen 2 .
- the projection device 1 can form a plurality of viewing regions on the display screen 2 so that the left eye and right eye of the viewer can see the adjacent viewing regions, respectively, and therefore the parallax effect can be provided and the 3D images can be generated in the viewer's brain.
- FIG. 6 just shows the relative position between the first spatial light modulator element 151 and the lens 16 of the projection device 1 for the clear understanding, but doesn't show the actual disposition. This is just for clearly understanding the imaging relation between the projection device 1 and the display screen 2 .
- the display screen 2 of this embodiment further includes a double lenticular lens.
- the double lenticular lens includes two lenticular lens layers 21 , 23 and a 2D diffuser disposed between the lenticular lens layers 21 , 23 .
- the light outputted from the projection device 1 will be condensed by the lenticular lens layer 21 to be imaged on the 2D diffuser 22 , and be then imaged again to the viewing plane of the viewer through the lenticular lens layer 23 .
- the lenticular lens layers 21 , 23 are made by the transparent material of high refractive index, such as UV-cured resin, thermosetting resin or plastic material. Moreover, the lenticular portion of the lenticular lens layers 21 , 23 can have a circular, elliptic, triangular or rectangular pattern.
- the lenticular lens layers 21 , 23 , the 2D diffuser 22 , and the curvatures and intervals thereof shown in the figures are just for the illustration, and can be adjusted according to the practical situation, such as the interval between the projection device 1 and the display screen 2 .
- FIG. 7A is a schematic diagram of an autostereoscopic projection device according to a second embodiment of the invention
- FIG. 7B is a schematic side view of the autostereoscopic projection device in FIG. 7A .
- the projection device of this embodiment is a 3-chip digital optical processing device.
- the light combining module 14 can further include a second light combining element 142 , which can be a total reflection prism for example.
- the spatial light modulator module 15 can further include a second spatial light modulator element 152 and a third spatial light modulator element 153 , both of which can be a digital micromirror device (DMD).
- DMD digital micromirror device
- the light emitted by the light source module 10 is transmitted through the light scanning module 12 , the light transmitting module 13 , the light combining module 14 and the spatial light modulator module 15 sequentially, and then leaves the projection device 1 through the lens 16 .
- the first and second light combining elements 141 and 142 of the light combining module 14 the light will be transmitted to the first, second and third spatial light modulator elements 151 , 152 , 153 (according to the incident angle on the light combining module). Then, after entering into the first, second and third spatial light modulator elements 151 , 152 , 153 , the light can be reflected by the first, second and third spatial light modulator elements 151 , 152 , 153 to enter into the second light combining elements 142 again and is then transmitted to the first light combining elements 141 through the second light combining elements 142 .
- the light beams outputted from the second light combining elements 142 travel along the same direction.
- the light that is reflected by the first, second and third spatial light modulator elements 151 , 152 , 153 to enter into the second light combining elements 142 will enter into the lens 16 along the same direction and is then imaged on the display screen 2 .
- the relation between the second and third spatial light modulator elements 152 , 153 and other elements is similar to the case of the first spatial light modulator elements 151 , and therefore it is not described here for conciseness.
- the light scanning module can transmit the light provided by the light source module to the spatial light modulator module in different angles at different timings. Therefore, the purpose of the conventional art where different viewing regions are produced at different timings by a plurality of light sources or switch elements can be achieved by the invention so that the conventional art can be replaced by the invention. Besides, the invention is capable of providing an autostereoscopic projection device which has simpler optical path design, simpler control mechanism, better conversion efficiency, and less volume and weight.
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Abstract
Description
- This Non-provisional application claims priority under 35 U.S.C. §119(a) on Patent Application No(s). 102140972 filed in Taiwan, Republic of China on Nov. 12, 2013, the entire contents of which are hereby incorporated by reference.
- 1. Field of Invention
- The invention relates to an optical device and, in particular, to an autostereoscopic projection device.
- 2. Related Art
- Recently, with the progress of the stereoscopic display technology, many stereoscopic products, such as stereoscopic movies and stereoscopic TVs, are produced for various commercial applications. The basic concept of the stereoscopic display technology is to transmit the left-eye images and the right-eye images with different viewing angles to the left eye and right eye of the viewer respectively, and both of these 2D images are then combined in the viewer's brain to give the perception of 3D depth while the viewer perceive the stereoscopic images.
- The stereoscopic display technology can be divided into the glasses type, head-mounted type and autostereoscopic type according to the applied tools. Especially, the autostereoscopic display technology attracts more attention from industries because it needn't stereoscopic glasses or head-mounted devices but can provide 3D images to the naked eyes of the viewers.
- A conventional autostereoscopic projection device cooperates with a plurality of projection apparatuses (may be disposed in an array) so that the left eye and the right eye can view different images. However, this kind of design causes a considerable difficulty to the compactness of the projection device, and the optical path design among the projection apparatuses will become more complicated. Another design for achieving the same purpose is to transmit the images of different angles to the left eye and right eye respectively at different timings by the liquid crystal (LC) switch elements. Although such design can reduce the volume of the projection device, more LC switch elements need to be used for the more viewing angles. For example, if 16 viewing angles are provided, four stages of two-phase LC switches are needed. Because the conversion efficiency ratio of each of the two-phase LC switches is about 90%, the actual total conversion efficiency ratio drops off to about 65.6% after the four-time LC switching. Accordingly, this design of using the switch elements not only complicates the control but also reduces the total imaging efficiency.
- Therefore, it is an important subject to provide an autostereoscopic projection device which has simpler optical path design, simpler control mechanism, better conversion efficiency, and less volume and weight.
- In view of the foregoing subject, an objective of the invention is to provide an autostereoscopic projection device which has simpler optical path design, simpler control mechanism, better conversion efficiency, and less volume and weight.
- To achieve the above objective, an autostereoscopic projection device according to the invention comprises a light source, a light scanning module, a light transmitting module, a light combining module, a spatial light modulator module and a lens.
- The light source provides a light. The light scanning module includes an actuating device and a reflective surface, and the actuating device capable of deflecting the reflective surface. The light combining module includes a first light combining element. The spatial light modulator module includes a first spatial light modulator element. The normal vector of an incident surface of the first light combining element is coplanar with the normal vector of a reflective surface of the first spatial light modulator element, and the coplanar plane is perpendicular to a disposition plane of the projection device.
- The light provided by the light source module is transmitted through the light scanning module, the light transmitting module, the light combining module and the spatial light modulator module sequentially and then leaves the projection device through the lens.
- In one embodiment, the light source module is a laser array or a laser unit.
- In one embodiment, the autostereoscopic projection device further comprises a light uniforming module disposed between the light scanning module and the light source module. The light is transmitted sequentially through the light uniforming module and the light scanning module.
- In one embodiment, the light combining module further includes a second light combining element, and the spatial light modulator module further includes a second spatial light modulator element and a third spatial light modulator element.
- After entering into the second spatial light modulator element and the third spatial light modulator element, the light is transmitted to the first light combining element by the second light combining element along the same direction.
- In one embodiment, the light scanning module is a voice coil motor, polygon mirror, or MEMS lens.
- In one embodiment, the spatial light modulator element is a digital micromirror device (DMD).
- In one embodiment, the actuating device of the light scanning module deflects the reflective surface for different angles at different timings to form a plurality of different viewing regions.
- In one embodiment, the light combining element is a total reflection prism.
- In one embodiment, the light transmitting module is a reflective mirror.
- A display device according to the invention comprises any of the above-mentioned autostereoscopic projection devices and a display screen. The autostereoscopic projection device forms a plurality of viewing regions on the display screen.
- In one embodiment, the light source module is a laser array or a laser unit.
- In one embodiment, the autostereoscopic projection device further comprises a light uniforming module disposed between the light scanning module and the light source module. The light is transmitted sequentially through the light uniforming module and the light scanning module.
- In one embodiment, the light combining module further includes a second light combining element, the spatial light modulator module further includes a second spatial light modulator element and a third spatial light modulator element, after entering into the second spatial light modulator element and the third spatial light modulator element, the light is transmitted to the first light combining element by the second light combining element along the same direction.
- In one embodiment, the light scanning module is a voice coil motor, polygon mirror, or MEMS lens.
- In one embodiment, the spatial light modulator element is a digital micromirror device (DMD).
- In one embodiment, the actuating device of the light scanning module deflects the reflective surface for different angles at different timings to form a plurality of different viewing regions.
- In one embodiment, the light combining element is a total reflection prism.
- In one embodiment, the display screen includes a double lenticular lens, and the double lenticular lens includes two lenticular lens layers and a 2D diffuser disposed between the lenticular lens layers.
- The invention will become more fully understood from the detailed description and accompanying drawings, which are given for illustration only, and thus are not limitative of the present invention, and wherein:
-
FIG. 1 is a schematic diagram of an autostereoscopic projection device according to a first embodiment of the invention; -
FIG. 2 is a schematic diagram of the imaging of the autostereoscopic projection device inFIG. 1 ; -
FIG. 3 is another schematic diagram of the imaging of the autostereoscopic projection device inFIG. 1 ; -
FIG. 4 is a schematic sectional diagram taken along the line A-A inFIG. 1 ; -
FIG. 5 is another schematic diagram of the imaging of the autostereoscopic projection device inFIG. 1 ; -
FIG. 6 is a schematic diagram of a display apparatus according to an embodiment of the invention; -
FIG. 7A is a schematic diagram of an autostereoscopic projection device according to a second embodiment of the invention; and -
FIG. 7B is a schematic side view of the autostereoscopic projection device inFIG. 7A . - The present invention will be apparent from the following detailed description, which proceeds with reference to the accompanying drawings, wherein the same references relate to the same elements.
- First of all, in the following embodiments and figures, the illustrated elements which are not directly related to the invention are omitted and not shown, and the size relation between the elements is just for the easier understanding but not for limiting the actual size ratio.
- The projection device of this embodiment can be a digital light processing (DLP) projection display, a liquid crystal projection display, or a liquid crystal on silicon (LCOS) projection display, for example.
-
FIG. 1 is a schematic diagram of an autostereoscopic projection device according to a first embodiment of the invention,FIG. 2 is a schematic diagram of the imaging of the autostereoscopic projection device inFIG. 1 ,FIGS. 3 and 5 are other schematic diagrams of the imaging of the autostereoscopic projection device inFIG. 1 , andFIG. 4 is a schematic sectional diagram taken along the line A-A inFIG. 1 . - The
projection device 1 of this embodiment at least includes alight source module 10, alight scanning module 12, alight transmitting module 13, alight combining module 14, a spatiallight modulator module 15 and alens 16. The light emitted by thelight source module 10 is transmitted through thelight scanning module 12, thelight transmitting module 13, thelight combining module 14 and the spatiallight modulator module 15 sequentially, and then leaves theprojection device 1 through thelens 16. - The
light source module 10 is disposed on a side of thelight scanning module 12 and can provide light. Thelight source module 10 can be a laser array or laser unit. - Besides, this embodiment can further include a light uniforming module 11 whereby the light can be uniformed into a bar-like light source entering into the
light scanning module 12. The light uniforming module 11 can be disposed between thelight scanning module 12 and thelight source module 10. The light is transmitted sequentially through the light uniforming module 11 and thelight scanning module 12. The light uniforming module 11 can be an integration rod or a light tunnel for example. - The
light scanning module 12 includes anactuating device 121 and a reflective surface, and theactuating device 122 is capable of deflecting thereflective surface 122. Thelight scanning module 12 can include a voice coil motor, polygon mirror, or MEMS lens, or their combinations. - The voice coil motor of this embodiment can be a galvano mirror, which further includes a movable coil (not shown) disposed within a magnetic field. Thereby, the movable coil can be driven by the current-induced electromagnetic force to rotate the shaft so as to deflect the reflective mirror that is connected to the shaft. Therefore, if the
light scanning module 12 is a galvano mirror, the angle of the reflective mirror can be adjusted by controlling the current value of the galvano mirror. - The angle of the
reflective surface 122 in this embodiment can be deflected for 20°˜30°. If the bar-like light provided by thelight source module 10 needs to be projected into 16 bar-like beams with different angles, the reflective surface can be deflected for 2.5° every time. In other embodiments, the bar-like light also can be projected into 32 different angles to form 32 viewing regions. In other words, the number of the projected angles can be adjusted according to the number of the viewing regions. - Accordingly, the
actuating device 121 of thelight scanning module 12 can make thereflective surface 122 deflect to different angles at different timings to form a plurality of viewing regions. Therefore, the light of thelight source module 12 on the X-Y coordinate plane can be transmitted to the Y-Z coordinate plane (as shown inFIG. 2 ) so as to be scanned and imaged on the Y-axis direction. - The
light transmitting module 13 is a reflective mirror disposed between thelight combining module 14 and thelight scanning module 12. Because thelight transmitting module 13 and thelight scanning module 12 have an included angle of 45°, the light will be deflected for 90° when transmitted from thelight scanning module 12 to thelight combining module 14, and can be imaged on the X-Z coordinate plane (as shown inFIG. 2 ). - The
light combining module 14 can include a firstlight combining element 141, which can be a total reflection prism. The firstlight combining element 141 can reflect the light of the incident angle greater than a predetermined angle (e.g. 40°) and can be passed through by the light of the incident angle less than the predetermined angle. Therefore, the light transmitted by thelight transmitting module 13 will be reflected and transmitted to the spatiallight modulator module 15. - It can be known from
FIG. 3 that the light can be imaged to the X-Y coordinate plane (the coordinates on the left of the figure) from the X-Z coordinate plane (the coordinates on the right of the figure) of the firstlight combining element 141 and then transmitted to the firstlight combining element 141 again. In this case, the incident angle of the light is less than the predetermined angle so the light will pass through the firstlight combining element 141. The region C in the figure represents the incident region through which the light can enter into the firstlight combining element 141 and can be transmitted to the projection lens. The region C represents the angle of the light that can pass through the first light combining element 141 (i.e. the incident angle less than the predetermined angle), so the light that is imaged to the portion outside the region C will be reflected (i.e. the incident angle greater than the predetermined angle). - The spatial
light modulator module 15 includes a first spatiallight modulator element 151, which can be a digital micromirror device (DMD) for example. - As an embodiment, if the first spatial
light modulator element 151 is a DMD, the DMD with the deflection range of 12°˜−12° (the region denoted by the dotted line B inFIG. 5 represents the conventional imaging range that is within 24°) can control or modulate the incident light by switch elements. When the DMD is at the “on” state, the light transmitted by the firstlight combining element 141 will be reflected into the firstlight combining element 141 again and then enter into thelens 16 to be imaged on thedisplay screen 2. Oppositely, when the DMD is at the “off” state, the light transmitted by the firstlight combining element 141 will not be imaged on thedisplay screen 2. - As shown in
FIG. 4 , in this embodiment, the normal vector V1 of theincident surface 141A of the firstlight combining element 141 is coplanar with the normal vector V2 of thereflective surface 151A of the first spatiallight modulator element 151, and the coplanar plane is perpendicular to the disposition plane P of theprojection device 1. - Furthermore, as shown in
FIGS. 2 and 5 , the firstlight combining element 141 and the first spatiallight modulator element 151 in this embodiment are disposed along the same direction, not like the conventional projection device where the firstlight combining element 141 and the first spatiallight modulator element 151 are disposed by an included angle of 45°. Therefore, this embodiment has the advantage of expanding the imaging range B of the spatial light modulator to the range B′ (the imaging range is expanded from 24° to 40° when the DMD is used as the spatial light modulator element for example), and therefore the etendue (the product of the area and the solid angle) of the total light of the projection device can be increased so that a larger amount of the light and more viewing regions for the imaging on thedisplay screen 2 can be obtained. -
FIG. 6 is a schematic diagram of a display apparatus according to an embodiment of the invention. - The
display apparatus 3 of this embodiment includes the above-mentionedprojection device 1 and thedisplay screen 2. Theprojection device 1 can form a plurality of viewing regions on thedisplay screen 2 so that the left eye and right eye of the viewer can see the adjacent viewing regions, respectively, and therefore the parallax effect can be provided and the 3D images can be generated in the viewer's brain. - To be noted,
FIG. 6 just shows the relative position between the first spatiallight modulator element 151 and thelens 16 of theprojection device 1 for the clear understanding, but doesn't show the actual disposition. This is just for clearly understanding the imaging relation between theprojection device 1 and thedisplay screen 2. - The
display screen 2 of this embodiment further includes a double lenticular lens. The double lenticular lens includes two lenticular lens layers 21, 23 and a 2D diffuser disposed between the lenticular lens layers 21, 23. In detail, the light outputted from theprojection device 1 will be condensed by thelenticular lens layer 21 to be imaged on the2D diffuser 22, and be then imaged again to the viewing plane of the viewer through thelenticular lens layer 23. - The lenticular lens layers 21, 23 are made by the transparent material of high refractive index, such as UV-cured resin, thermosetting resin or plastic material. Moreover, the lenticular portion of the lenticular lens layers 21, 23 can have a circular, elliptic, triangular or rectangular pattern.
- To be noted, the lenticular lens layers 21, 23, the
2D diffuser 22, and the curvatures and intervals thereof shown in the figures are just for the illustration, and can be adjusted according to the practical situation, such as the interval between theprojection device 1 and thedisplay screen 2. -
FIG. 7A is a schematic diagram of an autostereoscopic projection device according to a second embodiment of the invention, andFIG. 7B is a schematic side view of the autostereoscopic projection device inFIG. 7A . - Different from the 1-chip projection device of the first embodiment (
FIG. 1 ), the projection device of this embodiment is a 3-chip digital optical processing device. - In this embodiment, in addition to the first
light combining element 141, thelight combining module 14 can further include a secondlight combining element 142, which can be a total reflection prism for example. - Besides, in addition to the first spatial
light modulator element 151, the spatiallight modulator module 15 can further include a second spatiallight modulator element 152 and a third spatiallight modulator element 153, both of which can be a digital micromirror device (DMD). - The light emitted by the
light source module 10 is transmitted through thelight scanning module 12, thelight transmitting module 13, thelight combining module 14 and the spatiallight modulator module 15 sequentially, and then leaves theprojection device 1 through thelens 16. - In detail, by the first and second
light combining elements light combining module 14, the light will be transmitted to the first, second and third spatiallight modulator elements light modulator elements light modulator elements light combining elements 142 again and is then transmitted to the firstlight combining elements 141 through the secondlight combining elements 142. - Besides, the light beams outputted from the second
light combining elements 142 travel along the same direction. In other words, the light that is reflected by the first, second and third spatiallight modulator elements light combining elements 142 will enter into thelens 16 along the same direction and is then imaged on thedisplay screen 2. - The relation between the second and third spatial
light modulator elements light modulator elements 151, and therefore it is not described here for conciseness. - In summary, in the autostereoscopic projection device according to the invention, the light scanning module can transmit the light provided by the light source module to the spatial light modulator module in different angles at different timings. Therefore, the purpose of the conventional art where different viewing regions are produced at different timings by a plurality of light sources or switch elements can be achieved by the invention so that the conventional art can be replaced by the invention. Besides, the invention is capable of providing an autostereoscopic projection device which has simpler optical path design, simpler control mechanism, better conversion efficiency, and less volume and weight.
- Although the invention has been described with reference to specific embodiments, this description is not meant to be construed in a limiting sense. Various modifications of the disclosed embodiments, as well as alternative embodiments, will be apparent to persons skilled in the art. It is, therefore, contemplated that the appended claims will cover all modifications that fall within the true scope of the invention.
Claims (20)
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TW102140972A TWI498598B (en) | 2013-11-12 | 2013-11-12 | Autostereoscopic projection device and display apparatus comprising thereof |
TW102140972A | 2013-11-12 | ||
TW102140972 | 2013-11-12 |
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CN111443358A (en) * | 2020-03-12 | 2020-07-24 | 哈尔滨工业大学(深圳)(哈尔滨工业大学深圳科技创新研究院) | Single-point detection imaging system |
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US11287732B2 (en) | 2018-12-28 | 2022-03-29 | Hisense Laser Display Co., Ltd. | Optical illumination system and projection device |
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CN103995361B (en) * | 2014-06-17 | 2017-01-11 | 上海新视觉立体显示科技有限公司 | Naked eye 3D display pixel unit and multi-view naked eye 3D image display device |
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KR20230021733A (en) * | 2020-07-09 | 2023-02-14 | 에이에스엠엘 네델란즈 비.브이. | Measurement method and device, and computer program |
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TWI498598B (en) | 2015-09-01 |
TW201518773A (en) | 2015-05-16 |
US9535255B2 (en) | 2017-01-03 |
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